Describe the isoelectric point. With the help of an example explain the utility of this property of amino acids and how is it useful in maintaining pH in human systems.

The isoelectric point (pI) of a molecule refers to the pH at which the molecule carries no net electrical charge. For amino acids and proteins, the pI is the pH at which the sum of positive and negative charges on __________ ____ __________ ___ _____ ______ _________ ___.
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